COLD WEATHER ROOF

SYSTEM DETAILS (Cont'd)

In regions of heavy snowfall, shingles and shakes should be laid as a three-ply roof and installed by competent tradesmen according to the recommendations given in the pertinent sections of this manual.

Starter course for shingle roofs should be three layers. For shake roofs, superior construction at the eave is achieved by using two layers of shingles and one of shakes. Proper nailing is very important. All nails should be stainless steel type 304 or 316, hot-dipped, zinc coated galvanized or equivalent and placed 3/4" (19.05 mm) from edge and 1/2" (38.1 mm) above the butt line. Care must be taken in appyling the sheathing boards to facilitate proper nailing. Shingle or shake side lap should be increased to 2" (50.8 mm). The entire roof must be laid with the same precautions as those taken for any other type of wood shingle or shake roof, with eave protection and an interlay felt between shakes. Care in cold weather roof design and installation will result in a sound roof system giving many years service during severe extremes of winter temperatures and snowfall.